please show all formulas so i can catch on quickly

Cash Payback Period, Simple Rate of Return, NPV Drake Corporation is reviewing an investment proposal for a new piece of equipment- The The initial cost and estimates of the book value of the investment at the end of each year, the net cash year, and the net income for each year are presented in the schedule below. lows are assumed to take place at the end of the year. There would be no salvage valuce flows for each at the end of the investment's life. Investment Proposal Depreciation Net Cash Expense Initial Cost Annual Year Flow and Book Value Net Income $104,100 $50,000 50,000 50,000 50,000 33,600 28,100 70,500 16,400 42,400 21,900 21,800 13,800 20,600 28,200 36,200 43,200 4 6,800 50,000 0 6,800 Drake Corporation uses an 10% target rate of return (discount rate) for new investment proposals. (a) What is the cash payback period for this proposal? (b) What is the simple rate of return for the investment for each year? (c) What is the net present value of the investment? (c 1) What is the net present value of the investment if there is a $15,000 disposal cost at the end of the asset's useful life